Here's another comparison in case people are interested: http://blog.capography.com/comparing-traffic-from-betalist-w...

I should point out the comparison isn't totally fair as in this instance HN traffic is directed to specific blog posts, while the Beta List post linked to the homepage.

Disclosure: I'm the founder of Beta List (Marc). The post was written by one of the startups (Capography) featured on our site.